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Crystallization of triethyl-citrate-plasticized poly(lactic acid) induced by chitin nanocrystals

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10.1002/app.47936
 
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hdl:2117/176510

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Singh, Shikha
Maspoch Rulduà, Mª LluïsaMés informacióMés informacióMés informació
Oksman, Kristiina
Document typeArticle
Defense date2019-01-01
PublisherWiley
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
The aim of this study was to gain a better understanding of the crystallization behavior of triethyl-citrate-plasticized poly(lactic acid) (PLA–TEC) in the presence of chitin nanocrystals (ChNCs). The isothermal crystallization behavior of PLA–TEC was studied by polarized optical microscopy, scanning electron microscopy, differential scanning calorimetry, and X-ray diffraction (XRD). Interestingly, the addition of just 1 wt % ChNCs in PLA–TEC increased the crystallization rate in the temperature range of 135–125 °C. The microscopy studies confirmed the presence of at least three distinct types of spherulites: negative, neutral, and ring banded. The ChNCs also increased the degree of crystallinity up to 32%, even at a fast cooling rate of 25¿°C min-1. The XRD studies further revealed the nucleation effect induced by the addition of ChNCs and thus explained the faster crystallization rate. To conclude, the addition of a small amount (1 wt %) of ChNC to plasticized PLA significantly affected its nucleation, crystal size, and crystallization speed; therefore, the proposed route can be considered suitable for improving the crystallization behavior of PLA.
CitationSingh, S.; Maspoch, M.; Oksman, K. Crystallization of triethyl-citrate-plasticized poly(lactic acid) induced by chitin nanocrystals. "Journal of applied polymer science", 1 Gener 2019, p. 1-33. 
URIhttp://hdl.handle.net/2117/176510
DOI10.1002/app.47936
ISSN1097-4628
Publisher versionhttps://onlinelibrary.wiley.com/doi/10.1002/app.47936
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